Answer the following statements true (T) or false (F)
1. When some recessive human diseases are present in the heterozygous state, incomplete dominance occurs.
2. Only fathers can pass on pattern baldness to their sons.
3. A person with blood type O can donate blood to people of any blood type.
4. A Punnett square is best used to predict the likelihood of producing many offspring with a particular genotype.
5. Pea plants cannot self-fertilize because one plant has either ovaries and stamens, but not both.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
5. FALSE
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Communities near benthic hydrothermal vents survive in perpetual darkness, where no photosynthesis is possible
What do the producers of this ecosystem use as an energy source?
What will be an ideal response?Which molecule contains more energy?
a. ATP b. ADP
How are temperature sensitive mutants used to determine when genes act during development?
A) Embryos can be shifted to the restrictive temperature to inactivate the mutant gene and the effect of inactivation on subsequent stages can be observed. B) Embryos can be shifted to the permissive temperature to inactivate the mutant gene and the effect of inactivation on subsequent stages observed. C) Embryos can be incubated at the restrictive temperature for several hours. If the embryo develops normally, then the gene product is required during that period of development. D) Embryos can be raised at the permissive temperature and if the embryo does not die, then the gene product is not required for development.
The data in the graph best support which of the following claims?
(A) Environmental contamination elevates total testosterone oxido-reductase activity in females. (B) Environmental contamination reduces total testosterone oxido-reductase activity in females. (C) Environmental contamination elevates total testosterone oxido-reductase activity in males. (D) Environmental contamination reduces total testosterone oxido-reductase activity in males.